Going to have a new focus system that covers more of the sensor with cross hairs.
GPS.
Extreme Weather sealing.
7 or 8 frames per second shoot speed
All the previous removed functions restored.
A new JPEG engine.
Tethered shooting.
So is it any wonder that its taking a while to get it all working.

If it did come with all that, who would feel embarrassed for complaining about the amount of time without a successor?